Removable grip for ultrasound probe

ABSTRACT

A removable grip for an ultrasound probe. The grip may be an integrated or unitary hand-held device having a circular or C-shaped cross-section that, when located at a predetermined operative position on the probe, removably surrounds a substantial portion of the probe to provide an exterior shape and size optimal for a desired application. The probe is generally an elongated instrument having proximal and distal ends and an external casing that is grasped by a sonographer. An ultrasound transducer is generally disposed at the distal end and a cord for transferring data and power typically extends from the proximal end of the probe. The grip includes proximal and distal ends and, in one disclosed aspect, a channel for receiving the cord. The channel is defined by opposing edges of the grip that longitudinally extend between the proximal and distal ends. The channel extends through the grip from an exterior surface to an interior surface of the grip. The grip has an attachment feature that enables the grip to be detachably secured to the probe casing when in the operative position such that manual forces applied to the grip to position the probe against a patient do not cause the grip to detach from the probe.

BACKGROUND OF THE INVENTION

[0001] 1. Field of the Invention

[0002] The present invention relates generally to ultrasound probes and,more particularly, to removable grips for ultrasound imaging probes.

[0003] 2. Related Art

[0004] The use of ultrasound for medical imaging is well-known. Sinceits introduction, advances in technology and clinical practice have madeultrasound a leading medical diagnostic imaging modality. Ultrasoundprovides high-resolution real-time imaging without the use of ionizingradiation which is required for other techniques such as X-ray imaging.In addition, modern ultrasound equipment is relatively inexpensive andportable. This cost-effectiveness and portability has resulted in thewidespread application of ultrasound imaging to observe a considerablerange of physical conditions and to identify many types of disorders.For example, ultrasound imaging is commonly used in such clinicalapplications as obstetrics and gynecology, general abdominal imaging,vascular imaging and cardiology. This latter application, which is ofsignificance in the present application, is referred to asechocardiography.

[0005] Non-invasive echocardiography is performed generally using atransthoracic ultrasound imaging probe. Conventional transthoracicultrasound imaging probes are generally elongated devices having anultrasound transducer located on the distal end of the device body.Ultrasound probes are generally constructed of a hard plastic casing tofacilitate cleaning. Typically, the probe is maneuvered so that thetransducer is positioned adjacent to an external location on the bodywhere acoustic imaging is facilitated by the underlying tissue. Incardiac imaging, these locations, referred to as imaging windows, aretypically in the vicinity of the rib cage.

[0006] There are four primary echocardiographic imaging windows: thesuprasternal, subcostal, parasternal and apical windows. Theappropriateness of each imaging window depends upon the structures,functions and conditions to be diagnosed as well as the type and size ofthe patient. Each imaging window provides an opportunity to image aspecific portion or characteristic of the cardiac structures and/orfunctions depending on the portion of the heart which is nearest theselected imaging window, the angle of the probe at that window, and theintervening structures which may interfere with imaging the desiredcardiac structures. In addition, the utility of certain windows islimited by the size and condition of the patient. Accordingly, specificwindows are used to diagnose specific imaging conditions and disordersof specific patients.

[0007] When performing transthoracic echocardiographic procedures, thepatient is generally lying horizontally on his or her left side. Whilethe patient lies still in an appropriate position, the sonographerapplies the transducer to a predetermined imaging window on thepatient's body. The transducer must be positioned at the correctlocation and in the correct orientation at the selected imaging windowto successfully transmit the ultrasound signals at the proper angle soas to obtain clear and accurate cardiac images.

[0008] To place the probe in the proper position, the sonographer mustmaintain complete control over the probe throughout the echocardiographprocedure. This often requires the sonographer to apply a significantgripping force to the probe casing. Two techniques are commonly used.Left-handed scanning calls for holding the ultrasound probe with theleft hand while manipulating the ultrasound imaging system controls withthe right hand. Conversely, right-handed scanning calls for using theright hand to control the ultrasound probe while manipulating theimaging system with the left hand. Typically, a right-handed sonographeris positioned behind the horizontally-positioned patient. Thesonographer must reach completely around the right side of the patientto properly position the ultrasound probe at one of the ultrasoundimaging windows. The gripping force that must be applied by thesonographer to push and hold the probe in the proper location andorientation is significant in such an awkward position. In othersituations, the sonographer may have to work in environments even moreawkward, such as operating rooms, intensive care units, etc., as well aswith patients that have difficulty remaining still, such as children andinjured patients. It is not uncommon for the sonographer to repeat manyprocedures to ensure that the obtained images are accuraterepresentations of the cardiac condition and not artifacts due toimproper placement or orientation of the probe.

[0009] In addition, a large percentage of patients on whichechocardiography is performed are obese. With these patients, thesonographer must apply a significant axial force to the probe tocompress and displace layers of fat. Furthermore, the use of couplinggel to obtain a clearer image interferes with the sonographer'scapability to securely hold and control the ultrasound probe when thecoupling gel migrates from the transducer onto the gripping surfaces ofthe probe casing.

[0010] Conventional probes generally have surface features to enable thesonographer to establish the proper orientation of the probe. Forexample, some ultrasound probes have curves, scallops or ridges, whileother probes have a localized feature such as a line, rib, flute, buttonor some other feature on one side of the transducer. Although suchorientation-related features of conventional ultrasound probes mayprovide some incidental assistance to the sonographer to maintaincontrol over the probe, these features provide insignificant andinsufficient assistance, ancillary to the purpose of establishing properorientation of the probe.

[0011] What is needed, therefore, is a means for assisting asonographer's control of an ultrasound probe in various imagingscenarios, including different relative positions of the sonographer andthe patient, varying patient conditions, and the presence or absence ofcoupling gel. Also, a range of gripping styles and hand sizes should beaccommodated. The probe should be comfortable to hold and easilycontrollable with minimal gripping force to reduce fatigue and theoccurrence of occupational injuries.

SUMMARY OF THE INVENTION

[0012] The present invention is an apparatus and a method related to aremovable grip for an ultrasound probe. The grip is a hand-held devicethat, when located at a predetermined operative position on the probe,provides an exterior shape and size optimal for manually grasping duringa desired application. In one aspect, the grip has an attachment featurethat enables the grip to be detachably secured to the probe casing atthe operative position such that manual forces applied to the grip toposition the probe against a patient do not cause the grip to detachfrom the probe. The probe is generally an elongated instrument havingproximal and distal ends and an external casing that is grasped by asonographer. An ultrasound transducer is generally disposed at thedistal end and a cord for transferring data and power typically extendsfrom the proximal end of the probe.

[0013] In one aspect of the invention, a hand-held grip adapted toremovably surround a substantial portion of an ultrasound probe isdisclosed. The grip includes proximal and distal ends and a channel forreceiving the cord. The channel is defined by opposing edges of the gripthat longitudinally extend between the proximal and distal ends. Thechannel extends through the grip from an exterior surface to an interiorsurface of the grip so as to define a C-shaped cross-section of thegrip.

[0014] In one embodiment, the channel has a width larger than a diameterof the cord, enabling the cord to pass freely through the channel. Inanother embodiment, the grip is flexible and the grip has an unbiasedposition in which the width of the channel is smaller than the diameterof the cord and a biased position in which the width of the channel islarger than the diameter of the cord. In this embodiment, a force mustbe applied to cause the cord to travel through the channel.

[0015] The attachment feature may take on any number of configurations.In addition, the probe may include one or more features on the probecasing that may be utilized in embodiments of the attachment feature tofacilitate secure, yet detachable attachment of the grip. Thus, as usedherein, the term “attachment feature” broadly covers any feature,configuration, or other aspect of the grip that facilitates a secure,yet detachable, attachment of the grip to the probe when the grip islocated in the operative position on the probe. For example, in oneembodiment, the probe is contoured so that it is narrower at itsproximal and distal ends and wider in a mid-region between the proximaland distal ends. Here, the grip includes a tapered region on theinterior surface. The tapered region tapers from a wider cross-sectionalregion toward the proximal end of the grip to a narrower cross-sectionalregion toward the distal end of the grip. The narrower cross-sectionalregion of the grip has an unbiased position that interoperates with themid-region of the probe to prevent the grip from moving toward theproximal end of the probe.

[0016] In another embodiment, the exterior casing includes a raisedregion having a predetermined shape that provides an abutment surfacesubstantially orthogonal to the surface of the exterior casing and thelongitudinal axis of the probe. One or both of the opposing edges thatform the grip channel have formed therein a recess configured to receivethe raised region and to contact the abutment surface. As the grip istranslated over the exterior casing, the grip is placed in an unbiasedstate as the raised region travels through the grip channel. When therecess in the one or both opposing edges receives the raised region, thegrip attains a less-biased or unbiased state, resulting in the gripbeing detachably secured around a substantial portion of the probe.

[0017] The grip may also be detachably secured to the probe in aconfiguration in which the casing has at least one protrusion, and theattachment feature includes at least one corresponding indentation thatis adapted to interlock with the protrusion of the casing when the gripis located in its operative position on the probe. Alternatively oradditionally, the grip may have at least one protrusion and the casingat least one interlocking indentation. The protrusion of the grip isadapted to interlock with the indentation of the casing to detachablysecure the grip to the probe.

[0018] In yet another embodiment, screw threads are formed on theexternal casing of the probe. In this embodiment, the attachment featureincludes screw threads formed on the interior surface of the gripconstructed and arranged to threadedly interoperate with the screwthreads formed on the casing. In one particular embodiment, the gripincludes a notch in the interior surface to align the grip with a detenton the probe thereby preventing the grip from rotating relative to theprobe.

[0019] In one particular embodiment, interlocking mechanisms aredisposed on the opposing edges of the grip that form the channel. Theinterlocking mechanisms are adapted to interlock with each other toenable the grip to be detachably secured to the probe.

[0020] In another aspect, the grip is not detachably secured to theprobe. Rather, it is held in its operational position around the probeby manually applied axial forces toward the distal end of the probe. Inone particular embodiment, the probe is contoured to have across-section at the proximal that is less than a cross-section at thedistal end, with the external casing widening at a substantiallyconstant rate between the proximal and distal ends. To interoperate withsuch an external casing, an interior surface of the grip is contoured tohave a cross-section at the proximal that is less than a cross-sectionat the distal end, with the interior surface widening at a substantiallyconstant rate between the proximal and distal ends of the grip such thatthe tapered interior surface contacts the exterior casing of the probewhen the grip is in its operational position around the probe.

[0021] In many of the above or other configurations, the probe isnonaxisymmetric and the interior surface of the grip is alsononaxisymmetric to prevent the grip from rotating relative to the probe.The relative position of the grip with respect to the probe may bemaintained by abutting surfaces. The probe may have an abutting surfaceand the interior surface of the grip may have a corresponding abuttingsurface. Contact of the abutting surfaces of the grip and probe preventsaxial motion of the grip toward the distal end of the probe.

[0022] In another aspect of the invention a method for removablysurrounding a unitary, C-shaped, hand-held grip around a substantialportion of an ultrasound probe is disclosed. The grip comprises proximaland distal ends and a channel defined by opposing edges of the grip thatlongitudinally extend between the proximal and distal ends. The channelextends through the grip, from an exterior surface to an interiorsurface of the grip. The probe is constructed and arranged substantiallythe same as described above. The method comprises the steps of removablyreceiving the cord through a channel extending along the grip andreversibly translating the grip from a location in which the cord ispositioned with the grip to a location in which the grip surrounds thesubstantial portion of the probe.

[0023] Advantageously, the grip of the present invention, being largerthan the probe and having some or all of the attributes mentioned above,enables an administering sonographer to maintain control over theultrasound probe during transthoracic and other ultrasound imagingprocedures while applying minimal gripping force. As a result, thesonographer is required to use less gripping force throughout theprocedure, preventing fatigue and enabling the sonographer to performultrasound imaging procedures for longer periods of time without loss ofcontrol. Importantly, the grip enables the sonographer to efficientlyobtain accurate ultrasound images from desired ultrasound viewingwindows regardless of the position of the patient, the location of thesonographer relative to the patient, and whether the sonographer usesright- or left-handed techniques.

[0024] Further features and advantages of the present invention, as wellas the structure and operation of various embodiments of the presentinvention, are described in detail below with reference to theaccompanying drawings. In the drawings, like reference numbers indicatelike or functionally similar elements.

BRIEF DESCRIPTION OF THE DRAWINGS

[0025] This invention is pointed out with particularity in the appendedclaims. The above and further advantages of this invention may be betterunderstood by referring to the following description when taken inconjunction with the accompanying drawings, in which:

[0026]FIG. 1 is a side perspective view of one exemplary ultrasoundprobe suitable for use with the present invention.

[0027]FIG. 2 is a side perspective view of one embodiment of theremovable grip of the present invention in its operative position on theultrasound probe of FIG. 1.

[0028]FIG. 3 is a perspective view of the embodiment of the removablegrip shown in FIG. 2.

[0029]FIG. 4 is a side view of the grip of FIG. 3.

[0030]FIG. 5 is a front view of the grip of FIG. 3.

[0031]FIG. 6 is a side view of the grip of FIG. 3.

[0032]FIG. 7 is a cross-sectional side view of the grip of FIG. 3 takenalong the line 7-7 of FIG. 5 showing a tapered region and abuttingsurfaces.

[0033]FIG. 8 is a perspective view of an embodiment in which the probehas a rib-shaped protrusion and the grip includes a correspondingindentation or opening.

[0034]FIG. 9 is a perspective view of an embodiment of the gripsurrounding the probe in which a raised portion of the probe is alignedwith a correspondingly shaped opening formed by the edges of the channelof the grip.

[0035]FIG. 10 is a perspective view of an embodiment in which the griphas screw threads formed on its interior surface and the probe hascorresponding screw threads formed on the casing.

[0036]FIG. 11 is a cross-sectional view of an embodiment of the grip inwhich interlocking mechanisms are disposed on the edges of the channel.

DETAILED DESCRIPTION

[0037] The present invention is an apparatus and a method related to aremovable grip for an ultrasound probe. The grip removably attaches toan exterior surface of an ultrasound probe. When positioned at apredetermined operative position on the probe, the grip surrounds asubstantial portion of the probe to provide a gripping surface that iscomfortable to hold and easily controllable with minimal gripping force.

[0038] The probe is generally an elongated device having proximal anddistal ends and an external casing that is grasped by a sonographer. Atransducer array is generally disposed at the distal end and a cord fortransferring data and power typically extends from the proximal end ofthe probe. The grip is generally an elongated cylindrical device havingopenings at its proximal and distal ends. To attach the grip, theprobe's proximal end is inserted into the distal opening of the grip andthe grip is translated in an axial direction relative to the probetoward the distal end of the probe until the grip is located in itsoperative position on the probe. Removal of the grip is achieved througha reverse relative axial movement.

[0039]FIG. 1 is a side perspective view of an exemplary ultrasound probesuitable for use with the present invention. In this illustrativeembodiment, a probe 100 includes an external casing 102 which houseswell-known internal components. At a nose or distal end 104 of probe 100is an ultrasound transducer and a transducer lens (not shown) which isplaced against a patient's body to obtain ultrasound images. Attached toa tail or proximal end 106 of probe 100 is a cable assembly 108 to whichis attached a cord 110 for carrying power and data signals between probe100 and an ultrasound imaging system (not shown). The terms “distal end”and “proximal end” will be used herein to refer to those portions of thespecified element that are toward the nose and tail, respectively, ofprobe 100.

[0040]FIG. 2 is a perspective view of one embodiment of an ultrasoundprobe removable grip of the present invention installed in an operativeposition on ultrasound probe 100. FIG. 3 is a perspective view of aremovable grip installed on probe 100. FIGS. 4, 5 and 6 are left side,front and right side views of the removable grip illustrated in FIGS. 2and 3. FIG. 7 is a cross-sectional side view of the removable grip takenalong cross-section line 7-7 of FIG. 5.

[0041] Grip 200 has an outside cross-sectional diameter and exteriorshape sufficient to enable probe 100 (with grip 200 attached) to becomfortably held by a sonographer. The exterior shape and size of grip200 may be configured to accommodate any desired application. Forexample, in one embodiment, grip 200 has an exterior cross-sectionaldiameter and length (“size and shape”) that are optimal for theperformance of a particular ultrasound imaging procedure. Alternatively,other factors such as type of technique or training, size ofsonographer's hand, ergonomic objectives, etc. may be considered in thedetermination of the exterior size and shape of the exterior surface ofgrip 200. Thus, when grip 200 is attached to and surrounds probe 100, asonographer can maintain control of the probe when performingechocardiographic and other ultrasound procedures appropriate for probe100.

[0042] As noted, grip 200 removably attaches to probe 100. It may beused temporarily and, when desired, can be easily and quickly attachedto or detached from probe 100. Such attachment and detachment isachieved through a relative axial displacement of grip 200 relative toprobe 100; that is, grip 200 is slid over probe 100. For reasonsdescribed in detail below, grip 200 is configured to slide over probe100 in a direction as shown by arrow 201; that is, from proximal end 106toward distal end 104 of probe 100. Conversely, grip 200 is detached andremoved from probe 100 by translating grip 200 in a direction 207relative to probe 100.

[0043] It is envisioned that a sonographer may desire the use of grip200 during one portion of a procedure and not for others. To ensure thatgrip 200 is continually available for use and to facilitateincorporation of grip 200 into a procedure, grip 200 assumes twopositions: A detached position wherein grip 200 is located at someposition on cord 110, and an attached position wherein grip 200 is in anoperative position surrounding probe 100.

[0044] For example, when performing an echocardiographic procedure atthe subcostal window, probe distal end 104 is required to be orientedtoward the heart at such an angle that probe 100 is positionedsubstantially lengthwise against the patient's body. Absence of grip 200facilitates this procedure. Immediately thereafter a different viewingwindow such as the apical window may be used. Here, use of grip 200assists in the application of the requisite pressure to position probe100 at an angle that is less shallow than used at the subcostal window.An additional benefit stemming from the capability to have grip 200quickly and easily removed from probe 100 is that it allows casing 102and grip 200 to be cleared between ultrasound imaging procedures.

[0045] Grip 200 is generally cylindrical; that is, it is generally anelongated, tubular member having an exterior surface as described aboveand an interior hollow region 203 defined by an interior surface 202.Grip 200 has a distal end 204 for receiving probe 100 when grip 200 isattached to probe 100, and a proximal end 206 through which cable 108extends when grip 200 is operatively attached to probe 100.

[0046] It is anticipated that circumstances may arise that require theuse of more than one grip in a relatively short period of time and, inparticular, during a single sonographic procedure with a single patient.For example, if a sonographer is having difficulty in obtaining an imageusing one grip, a second grip having a different shape and size mayprovide the needed assistance. In other circumstances, a sonographer mayexperience reduced grip strength, increased pain or other condition thatmay be rectified or alleviated by substituting a grip currentlyinstalled on probe 100 with a different grip having a different exteriorsize and shape. In addition, a second sonographer may be involved in theadministration of a sonographic procedure, requiring the use of a secondgrip appropriate for the second sonographer. For example, when an imagecannot be obtained or the integrity of the obtained image is inquestion, a second sonographer may be involved to obtain thoseparticular images. A grip appropriate for the second sonographerfacilitates the accurate attainment of such images. As such, inaccordance with one aspect of the invention grip 200 is one of a set ofgrips. The set of grips may include grips of various sizes and shapes,all of which may be used with a single probe 100 due to a commoninterior configuration described below.

[0047] To facilitate the fast and easy substitution of such grips,certain embodiments of grip 200 preferably have a C-shapedcross-section. Referring to FIGS. 3, 5 and 6, a channel 210 is formedwithin such embodiments of grip 200. Channel 210 is defined by opposingedges 209 and 211 extending longitudinally along the length of grip 200between proximal end 206 and distal end 204. Channel 210 extends fromexterior surface 212 to interior surface 202, as best shown in FIGS. 5and 6. Such a configuration, described in greater detail below, enablesgrip 200 to be removed from cord 110 when in the detached positionaround cord 110, and allows for the rapid incorporation of a differentgrip 200 into a sonographic procedure simply by passing cord 110 throughchannel 210 in the appropriate direction.

[0048] Thus, grip 200 is initially installed by receiving cord 110through channel 210. Grip 200 is then translated toward probe distal end104 to its detachably secured operative position around probe casing102. Grip 200 may be uninstalled by applying a requisite axial force togrip 200 in direction 207. Such a force causes grip 200 to detach fromcasing 102 and translate in direction 207 relative to probe 100 to aposition beyond probe proximal end 106. Grip 200 is completely removedby pulling cord 110 through channel 210 from interior region 203 to theexterior of grip 200. An additional benefit associated with the completeremoval of grip 200 from probe 100 is that grip 200 can be cleanedseparately from probe 100. This also permits the same grip 200 to beused on multiple probes 100 having similar external casing 102. Also,removal of grip 200 allows disposable embodiments of grip 200 to bediscarded and replaced by another grip 200.

[0049] Preferably, channel 210 is sized to allow cord 110 to passtherethrough as well as to retain cord 110 within interior region 203 ofgrip 200, preventing grip 200 from inadvertently separating from cord110. In one embodiment, the width of channel 210 along a portion ofchannel 210 is slightly less than a diameter of cord 110. In such anembodiment, grip 200 is flexible and has a shape memory. Grip 200 iscapable of being biased so that channel 210 widens enough to receivecord 110. After cord 110 is received into region 203, grip 200 resumesits unbiased position and channel 210 narrows, thereby preventing theunassisted passage of cord 110 through channel 210. Such assistance maybe provided with minimal manual force applied to cord 110 and grip 200to cause cord 110 to pass through channel 210.

[0050] In another embodiment, the width of channel 210 is slightlylarger than the diameter of cord 110. Although in this embodiment cord110 has a greater likelihood of accidentally separating from grip 200,cord 110 generally is retained within grip 200 because in a slackenedstate cord 110 flexes or pleats. The flexure prevents a sufficientlength of cord 110 to simultaneously align with and pass through channel210. It should be apparent that any other number of relative states ofchannel diameter and channel width may be implemented.

[0051] In certain aspects of the illustrative embodiment of the presentinvention, grip 200 includes an attachment feature that enables grip 200to be detachably secured to probe 100. In certain aspects of theinvention the attachment feature interoperates with features of probecasing 102 to enable grip 200 to be maintained in its operative positionduring normal use of probe 100. In other aspects of the invention, theattachment feature may not interoperate with any particular feature orfeatures, but interoperates generally with exterior casing 102.

[0052] Since probe 100 is just one of many probe configurations to whichembodiments of grip 200 may be attached, embodiments of the attachmentfeature may take on any number of configurations, some of which aredescribed herein. In addition, probe 100 may include one or morefeatures on exterior casing 202 that may be utilized in embodiments ofthe attachment feature to facilitate secure yet removable attachment ofgrip 200. Thus, as used herein, the term “attachment feature” broadlycovers any feature, configuration, or other aspect of grip 200 thatfacilitates a secure yet detachable attachment of grip 200 to probe 100.

[0053] In the illustrative embodiment shown in FIGS. 3-7, the attachmentfeature comprises tapered regions formed within interior surface 202 ofgrip 200 so as to complement and interoperate with tapered regions ofprobe 100 to achieve the desired retention of grip 200 in its operativeposition. Referring again to FIG. 1, casing 102 has a tapered region 120in which a cross-section of casing 102 tapers from a first narrowerregion 122 adjacent to proximal end 106 to a wider mid-region 124.Casing 102 then tapers from mid-region 124 to a second narrower region126 adjacent distal end 104. Referring to FIGS. 5-7, the attachmentfeature includes complementary tapered region 220 formed on interiorsurface 202 having a configuration that enables grip 200 to interlockwith probe tapered regions 120 when grip 200 is installed at theoperative position on probe 100. As best shown in FIG. 7, tapered region220 on interior surface 202 has an inner cross-section that causesinterior surface 202 to taper from a narrower region 226 adjacent distalend 204 to an adjacent wider region 224. The rate and extent of suchtapers corresponds to those of probe 120.

[0054] As grip 200 is translated from around cord 110 toward distal end104 of probe 100, narrower region 226 of grip 200 passes freely over thefirst narrower region 122 adjacent proximal end 106 of probe 100 untilit reaches the wider mid-region 124 of probe 100. As grip 200 is axiallytranslated further toward distal end 104, wider mid-region 124 pushesoutward narrower region 226 of grip 200 so that grip 200 is biasedoutward. This enables narrower region 226 of grip 200 to pass over widermid-region 124 of probe 100 until the narrower region 226 of grip 200reaches second narrower region 126 adjacent distal end 104 of probe 100where grip 200 returns to its unbiased position. In the unbiasedposition, grip 200 is fully inserted in its operative position on probe100, with narrower region 226 of grip 200 aligned with second narrowerregion 126 adjacent distal end 104 of probe 100. Grip 200 is held inthis unbiased position by the adjacent wider mid-region 124 of probe 100which prevents the narrower region 226 of grip 200 from freely passingback toward proximal end 106 of probe 100 without application of someforce to overcome the shape memory of grip 200.

[0055] As can be appreciated, the axial manual force applied to grip 200during operation can vary greatly. In particular, axial force indirection 201 toward distal end 104 of probe 100 must be applied toplace firmly probe 100 against the patient. As such, in the illustrativeembodiment opposing abutting surfaces on the grip 200 and probe 100prevent axial forces applied in direction 201 when grip 200 is in itsoperative position to cause grip 201 to continue to travel in direction201 relative to probe 100 to a non-operative position.

[0056] In the illustrative embodiment, casing 102 includes two steppedsurfaces 140 adjacent probe proximal end 106. Interior surface 202 ofgrip 200 has two similarly stepped surfaces 240 adjacent proximal end206 of grip 200. When grip 200 is initially installed onto probe 100,grip 200 is translated axially relative to probe 100 until grip 200 islocated at its operative position around probe 100. Upon reaching suchan operative position, stepped surfaces 240 abut against steppedsurfaces 140, preventing further travel of grip 200 toward distal end104 of probe 100. As a result, abutting surfaces 140 and 240 preventgrip 200 from separating from probe 100 when an axial force is appliedtoward the distal end 106 of the probe 100. In alternative embodiments,additional features (described below) may be included in embodiments ofthe attachment feature.

[0057]FIG. 8 is a perspective view of an embodiment in which the probehas a rib-shaped protrusion and the grip includes a correspondingindentation or opening. In such an embodiment, the attachment featureincludes a protrusion 130 on casing 102 and a corresponding indentations230 formed on interior surface 202 of grip 200. The protrusion andindentation are complementary in shape including, for example,spherical, cylindrical, or rib-shaped configurations. To attach, grip200 is translated toward distal end 104 of probe 100, as noted above.When grip 200 reaches protrusion 130 on casing 102, it is biased outwarduntil protrusion 130 aligns with indentation 230. When protrusion 130aligns with indentation 230, grip 200 resumes its unbiased position andis prevented from moving toward either distal 104 or proximal end 106 ofprobe 100, absent application of some predetermined force suitable forovercoming such a snap fit. Alternatively or additionally, interiorsurface 202 of grip 200 may be formed with a protrusion and casing 102formed with an indentation.

[0058]FIG. 9 is a perspective view of an alternative embodiment of theattachment feature of the present invention wherein probe 100 has araised portion 170 on probe casing 102. In this embodiment, grip 200 hasa correspondingly-shaped channel opening 270 defined by edges 209 and211 of grip 200. Grip 200 is secured to probe 100 through theinteroperation of raised portion 170 on casing 102 and channel opening270. In the illustrative embodiment, raised portion 170 has a narrowersection 172 adjacent proximal end 106 and a wider section 174 adjacentdistal end 104. Channel opening 270 is similar in shape to raisedportion 170 with a narrower section 272 toward proximal end 206 and awider section 274 toward distal end 204. As grip 200 is translatedaxially along probe 100 from proximal end 106 to distal end 104, channel210 is initially separated by raised region 170. Continued relativetranslation causes additional separation until wider section 174 enterschannel 210. When channel opening 270 aligns with raised portion 170,grip 200 snaps around raised portion 170 and resumes its unbiasedposition. The interaction of channel opening 270 with raised portion 170prevents both axial and rotational movement of grip 200 relative toprobe 100.

[0059]FIG. 10 is a perspective view of probe 100 and grip 200incorporating another embodiment of the attachment feature of thepresent invention. In this embodiment, grip 200 is detachably mounted toprobe 100 by interoperating screw threads. Interior surface 202 of grip200 is formed with internal screw threads 250. Casing 102 is formed withexternal screw threads 150. Grip 200 is threadedly attached to probe100. A detent may be provided at the distal end of the screw threads ofprobe 100 and a notch may be provided at the distal end of the screwthreads of grip 200 to provide alignment of grip 200 with probe 100 fororientation purposes and to prevent grip 200 from rotating relative toprobe 100 when a slight rotational force is applied.

[0060] It should be understood that other mechanisms and techniques forinsuring grip 200 is detachably retained on probe 100 during normaloperations may be used. For example, in one alternative embodiment, theattachment feature implements a friction or interference-type fit. Insuch an embodiment, the interior cross-section of interior surface 202may be smaller than the exterior cross-section of casing 102. In such aconfiguration, grip 200 is biased outwardly to install it around casing102 and is detachably secured to casing 102 by virtue of the forceurging grip 200 to its smaller, unbiased position.

[0061] An alternative embodiment of the attachment feature isimplemented in embodiments of grip 200 that have a C-shapedcross-section as shown in FIGS. 3-7. This additional attachment feature,referred to as an interlocking mechanism, is shown in thecross-sectional view of FIG. 11. As shown in FIG. 11, opposing edges 209and 211 have interlocking surfaces 282 and 284 forming a tongue andgroove connection that easily mate. As one skilled in the art will findapparent other interlocking mechanisms may be used.

[0062] In another aspect, the grip 200 is not detachably secured to thecasing 102. Rather, it is held in its operational position around theprobe by manually applied axial forces toward the distal end of theprobe 100. In one particular embodiment, the probe is contoured to havea cross-section at the proximal end that is less than a cross-section atthe distal end, with the external casing widening at a substantiallyconstant rate between the proximal and distal ends. To interoperate withsuch an external casing 102 , an interior surface 202 of the grip iscontoured to have a cross-section at the proximal end that is less thana cross-section at the distal end, with the interior surface widening ata substantially constant rate between the proximal and distal ends ofthe grip such that the tapered interior surface contacts the exteriorcasing of the probe when the grip is in its operational position aroundthe probe.

[0063] In addition to the above features, casing 102 and interiorsurface 202 of grip 200 may take a variety of shapes. In certainembodiments, casing 102 of probe 100 and interior surface 202 of grip200 are nonaxisymmetric as illustrated in FIGS. 1 and 2. This asymmetryprevents the grip 200 from rotating relative to probe 100.

[0064] In a further embodiment, grip 100 provides an orientationindication. When grip 200 is attached to the probe 100, grip 200 isaligned with an orientation feature of the probe 100. One type oforientation feature is the spline or ridge 114 shown in FIGS. 2 and 8.Ridge 114 fits within channel 210. Because channel 210 is aligned withprobe 100, the orientation of probe 100 is readily ascertained by thesonographer by either seeing or touching channel 210, allowing thesonographer to easily properly orient probe 100 for performing imagingprocedures. Grip 200 may also be color coded to correspond with aparticular type or model of ultrasound probe 100.

[0065] Surface features on exterior surface 114 of grip 200 aredesirable to prevent the sonographer's hand from slipping on the grip.In the embodiment shown in FIGS. 3-7, ribs 214 are provided orthogonalto the longitudinal axis of the grip. Other types of non-slip surfacesare also envisioned, such as a texturized surface with a plurality ofbumps.

[0066] In alternative embodiments, grip 200 may take on otherconfigurations that enable it to be attached and detached from probe100. For example, in applications where easy removal is not required ordesired, grip 200 may be a continuous, unitary member; that is, nochannel 210 may be provided. In alternative embodiments, grip 200 maycomprise two half-shells that are hinged with interlocking mechanisms atopposing longitudinal edges. These and other configurations that enablegrip 200 to be removably secured to probe 100 and, when in an attachedposition, assist a sonographer in the performance of the intendedprocedure, are considered to be within the scope of the presentinvention.

[0067] Because grip 200 is removable, a single probe 100 may be usedwith grips of various materials. In one embodiment, the removable grip200 withstands repeated applications of autoclaving, gas sterilization,liquid disinfection and other commonly used methods of sterilization.Materials suitable for a grip that can withstand such sterilizationmethods include polyetherimide, polyethersulfone, polyether ketone ormetal, among others. The ability of grip 200 to withstand repeatedapplications of such sterilization techniques enables grip 200 to bereused.

[0068] Alternatively, grip 200 may be sterilizable, but notautoclavable. Sterilization techniques not requiring autoclavinginclude, application of a combination of hot water and variouschemicals. Such a sterilizable material may have high chemicalresistance as, for example, resistance without substantial deteriorationfor thirty days to materials encountered in the use environment whichinclude isopropanol, glutaraldehyde, Clorox (5% sodium hypochlorite),and peracetic acid. Suitable materials for a sterilizable but notautoclavable grip include polyester, ABS, polycarbonate, andpolycarbonate blend. Grip 200 may also be made from a material thatcannot withstand sterilization and is disposable after use.

[0069] Preferably, the grip 200 is made from a substantially rigidmaterial having a modulus of elasticity in the range of 250,000 to1,200,000 psi. Grip 200 may also have a good tear resistance as, forexample, tear strength of greater than 300 lb/in, ASTM D1922.Alternatively, grip 200 is constructed of more than one material withthe interior surface 202 being a substantially rigid material having amodulus of elasticity in the range of 250,000 to 1,200,000 psi andexterior surface 212 being a substantially compressible material of lowdurometer in the range of Shore A3-65, ASTM D2240. The substantiallyrigid material of interior surface 202 provides for secure attachment ofthe grip 200 to casing 102 and the substantially compressible materialof exterior surface 212 provides for a non-slip and comfortable hold forthe sonographer.

[0070] Advantageously, various aspects and embodiments of grip 200 ofthe present invention enable an administering sonographer to maintaincontrol over the ultrasound probe during transthoracic and otherultrasound imaging procedures while applying minimal gripping force. Asa result, the sonographer is required to use less gripping forcethroughout the procedure, preventing fatigue and enabling thesonographer to perform ultrasound imaging procedures for longer periodsof time without loss of control. Importantly, grip 200 enables thesonographer to efficiently obtain accurate ultrasound images from allultrasound viewing windows regardless of the position of the patient,the location of the sonographer relative to the patient, and whether thesonographer uses right- or left-handed techniques.

[0071] While various embodiments of the present invention have beendescribed above, it should be understood that they have been presentedby way of example only, and not limitation. For example, althoughvarious embodiments have been disclosed in connection with certainaspects of the present invention, it should be understood that suchembodiments may be combined in any combination that is non-conflictingor otherwise feasible. Thus, the breadth and scope of the presentinvention are not limited by any of the above-described exemplaryembodiments, but are defined only in accordance with the followingclaims and their equivalents.

What is claimed is:
 1. A hand-held grip adapted to removably surround asubstantial portion of an ultrasound probe, the probe having a casing,proximal and distal ends and a cord extending from the proximal end, thegrip comprising: proximal and distal ends and an exterior shape and sizesuited for manually grasping during a desired application.
 2. The gripof claim 1 , wherein the grip further comprises: a channel, defined byopposing edges extending along the length of said grip between saidproximal and distal ends, and extending from an exterior surface to aninterior surface.
 3. The grip of claim 1 , wherein the grip furthercomprises: an attachment feature on said interior surface of the grip,said feature constructed and arranged to enable said grip to bedetachably secured to the casing of the probe.
 4. The grip of claim 2 ,wherein said channel has a width larger than the diameter of the cordextending from the probe.
 5. The grip of claim 2 , wherein said grip hasan unbiased position in which said channel has a width smaller than thediameter of the cord and a biased position in which said channel has awidth larger than the diameter of the cord.
 6. The grip of claim 3 ,wherein the probe is contoured so that it is narrower at its proximaland distal ends and wider in a mid-region between the proximal anddistal ends, wherein said feature comprises a tapered region on theinterior surface, said tapered region tapering from a widercross-sectional region toward the proximal end of the grip to a narrowercross-sectional region toward the distal end of the grip, and whereinsaid narrower cross-sectional region has an unbiased position that isadapted to interoperate with the mid-region of the probe to prevent saidgrip from moving toward the proximal end of the probe.
 7. The grip ofclaim 3 , wherein the probe has at least one protrusion, and whereinsaid feature comprises at least one of a corresponding indentation andan opening that is adapted to interlock with the at least one protrusionwhen said grip is positioned around the probe.
 8. The grip of claim 3 ,wherein the probe has at least one indentation on the casing, andwherein said feature comprises at least one corresponding protrusion onsaid interior surface of said grip that is adapted to interlock with theat least one indentation when said grip is positioned around the probe.9. The grip of claim 2 , wherein the casing of the probe has a raisedportion that is narrower toward the proximal end and wider toward thedistal end and said opposing edges of said grip form an opening shapedsimilarly to the raised portion of the casing, and wherein said openingis pressed further open by the raised portion of the casing and alignswith the raised portion of the casing to detachably secure said griparound a substantial portion of the probe.
 10. The grip of claim 3 ,wherein the probe has screw threads formed on the casing and whereinsaid feature comprises screw threads formed on said interior surface ofthe grip that threadedly interoperate with the screw threads formed onthe casing.
 11. The grip of claim 10 , wherein the probe has a detentand said grip includes a notch in said interior surface to align saidgrip with the detent of the probe to prevent said grip from rotatingrelative to the probe, and to orient said grip with the probe.
 12. Thegrip of claim 1 , wherein said interior surface has a smallercross-section than said casing, providing for an interference-type fitto detachably secure said grip on the probe.
 13. The grip of claim 2 ,wherein each of said opposing edges has an interlocking mechanismdisposed thereon to enable said grip to be detachably secured to theprobe.
 14. The grip of claim 1 , wherein the probe is nonaxisymmetricand wherein said interior surface is nonaxisymmetric to prevent saidgrip from rotating relative to the probe.
 15. The grip of claim 1 ,wherein the probe has an abutting surface and wherein said interiorsurface comprises an abutting surface that abuts with the abuttingsurface of the probe to prevent axial motion of said grip toward thedistal end of the probe.
 16. The grip of claim 1 , wherein said exteriorsurface comprises at least one raised gripping surface.
 17. The grip ofclaim 1 , wherein the probe has an orientation feature, and wherein saidchannel is aligned with the orientation feature of the probe to providean orientation indication.
 18. The grip of claim 1 , wherein said gripcomprises a material that is autoclavable.
 19. The grip of claim 1 ,wherein said grip comprises a material that has high chemical resistanceincluding resistance without substantial deterioration for thirty daysto materials encountered in the use environment which includeisopropanol, glutaraldehyde, Clorox (sodium hypochlorite hydroxide) andperacetic acid.
 20. The grip of claim 1 , wherein said grip comprises amaterial that has good cut resistance including tear strength of greaterthan 300 lb/in, ASTM D1922.
 21. The grip of claim 1 , wherein said gripcomprises a material that is selected from the group consisting of athermoplastic, an elastomer, a thermoplastic elastomer, and a metal. 22.The grip of claim 1 , wherein said grip comprises a material that issubstantially non-compressible when subject to hand forces, having amodulus of elasticity in the range of 250,000 to 1,200,000 psi.
 23. Thegrip of claim 1 , wherein said interior surface comprises asubstantially non-compressible material having a modulus of elasticityin the range of 250,000 to 1,200,000 psi and said exterior surfacecomprises a material of low durometer in the range of Shore A3-65, ASTMD2240.
 24. A method for removably surrounding a hand-held grip around asubstantial portion of an ultrasound probe, the probe having a casing,proximal and distal ends and a cord extending from the proximal end, themethod comprising: (a) removably receiving the cord through a channelextending along the grip; and (b) reversibly translating said grip fromaround the cord to around the probe.
 25. The method of claim 24 ,further comprising detachably securing said grip to the probe.
 26. Themethod of claim 24 , further comprising: translating said grip fromaround the probe to around the cord; and removing the cord from saidchannel.